17. 17. Bar diameter for external threads (for cutting type dies)

■Sewing machine screw threads (for 2nd class)

■ Unit : mm

Sizemajor diameter of external threadsbar diameter (ref)
dmaxdmin.
SM 80 1/161.5881.5181.54
SM 64 5/641.9841.9041.92
SM 56 3/322.3812.2862.31
SM 100 3/322.3812.3062.32
SM 40 1/83.1753.0453.08
SM 44 1/83.1753.0553.09
SM 40 9/643.5723.4423.47
SM 40 11/644.3664.2364.27
SM 24 3/164.7624.6024.64
SM 28 3/164.7624.6024.64
SM 32 3/164.7624.6024.64
SM 32 7/325.5565.3965.44
SM 28 15/645.9535.7735.82
SM 24 1/46.3506.1706.22
SM 40 1/46.3506.2206.25
PdmaxdminTdmaxdminTNo.0-80UNF1.5111.4311.45
4.541.93741.4370.50041.93041.6100.320No.1-64UNC1.8381.7431.77

1.5 41.968 41.732 0.236 41.950 41.780 0.170 No.3-48UNC 2.496 2.383 2.41

244.96244.6820.28044.94044.6400.300No.5-40UNC3.1543.0263.06
447.94047.4650.47547.94047.4650.475No.6-40UNF3.4843.3563.39
M48 347.95247.5770.37547.95247.5770.375No.8-32UNC4.1423.9914.03
No.10-32UNF4.8034.6514.69
No.12-24UNC5.4615.2795.32
1/4-28UNF6.3246.1606.20
・from table 2 JIS B 0226 (void in 2001)
5/16-18UNC7.9077.6877.74
5/16-24UNF7.9097.7277.77
3/8-16UNC9.4919.2549.31
3/8-24UNF9.4979.315■ ■ 9.36
7/16-14UNC11.07610.816Parallel pipe threads (PF · G)(for A class) Taper pipe threads (PT, R) 10.88
Unit : mm Unit : mm
7/16-20UNF11.07910.87410.93
Sizebar diameter (ref.)
taper (dia of thread end)Straight
PT1/16 - 287.57.9
PT1/8 - 289.59.9
PT1/4 - 1912.813.4
PT3/8 - 1916.316.9
PT1/2 - 1420.521.3
PT3/4 - 1425.926.8
PT1 - 1132.733.7
PT11/4 - 1141.242.3
PT11/2 - 1147.148.2
PT2 - 1158.760.1
Sizemajor diameter of external threadsbar diameter (ref)
dmaxdmin.
PF1/16 - 287.7237.5097.56
PF1/8 - 289.7289.5149.57
PF1/4 - 1913.15712.90713.0
PF3/8 - 1916.66216.41216.5
PF1/2 - 1420.95520.67120.7
PF5/8 - 1422.91122.62722.7
PF3/4 - 1426.44126.15726.2
PF7/8 - 1430.20129.91730.0
PF1 - 1133.24932.88933.0
PF11/8 - 1137.89737.53737.6
PF11/4 - 1141.91041.55041.6
PF11/2 - 1147.80347.44347.5
PF2 - 1159.61459.25459.3
9/16-12UNC14.24613.95814.0
5/8-18UNF15.83915.61915.7
7/8-14UNF22.18421.92322.0
1-8UNC
1 1/8-12UNF28.52928.24028.3
1 3/8-12UNF34.87634.58834.7
1 1/2-12UNF38.05137.76337.8
1 3/4-5UNC44.38143.86144.0
2-4.5UNC50.72650.16850.3